nRF5340 : How to transfer custom data between app core and net core using IPC when Bluetooth also ON

[Siddharth Kachhia]

Hello,

Currently In nRF5340DK, we are trying to transfer custom data(ver. info) between app core and net-core.

With IPC_service, we can transfer/communicate between app-core and net-core. But when we add ipc_service logic into BT enabled code, it did not work. With BT enabled code, didn't receive ep(ipc0) bound/received callback.

Could you please help us with communication between app & net core for nRF5340DK ?

[Vidar Berg]

Hello,

I will have to check how/if you can do this without interfering with the BT Host + controller communication and get back to you.

Are you only looking to retrieve version information from the network core?

[Siddharth Kachhia]

As of now, I want to send version request from app core to net core And then want to receive net core version into response of the request from net core to app core.

This version information would be performed with BT enabled too.

[Vidar Berg]

OK, thanks for confirming. I've created an example now to demonstrate how you can retrieve the version number from the fw_info struct (Firmware information) located in the net core image. The example is included below. 

Demo project

read_fw_info_from_netcore_demo.zip

For this example I ended up using the Remote procedure call library (nRF RPC). This allowed me to create a callable function for the app core to read the version number while the BLE stack is enabled. It can also be expanded to include more functions if needed.

Code used to read the FW version number from the main app:

	...
	
	printk("Advertising successfully started\n");

	err = netcore_fw_version_get(&version_number);
	if (err) {
		printk("Failed to read FW version from network core. (%d)\n", err);
	}
	else {
		printk("HCI RPMsg FW version: %d\n", version_number);
	}
	...

The returned version number will correspond to the value of the CONFIG_FW_INFO_FIRMWARE_VERSION symbol used in the HCI RPMsg build.

Best regards,

Vidar

 

[John Lee]

I want something similar to the questioner.
So I'd like to refer to the sample in the answer.
But I am unable to run the sample with errors.
At main.c, line 223 I get -5 error.
Tracing with the debugger gives an error at hci_core.c, line 1677.
I am using ncs 2.3
Are the samples not available for ncs 2.3?

[Vidar Berg]

Please try with ncs 2.1.1 first. That is the version I used when I made the demo.